Ok...it wasn't life altering or anything...I was just curious why it was happening so often on this site and nowhere else...so basically no one really knows for sure. No problem.
End of WebGizmos's quote
I know 'for sure'....as I said 'cookies'.... JAFOCHECK
When a site reliant on a browser's history of interaction with the site is updated/revised/rebooted the cookies would need to be rewritten/updated too.
Tracking is used to let the site show you specifically whether you have already read a thread...or not, etc. If the cookies are prevented from updating or are deleted through expiry [and not allowed to rewrite] the site will fail to recognize you...and one obvious result will be your sudden logout...;)